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SUMMARY:Slip Circle Constructions for Dislocation Plasticity\, with Specia
 l Reference to Nanoindentations - Prof. L M Brown\, Surfaces\, Microstruct
 ure and Fracture Group\, Cavendish Laboratory
DTSTART:20070201T160000Z
DTEND:20070201T170000Z
UID:TALK6307@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:On general grounds\, it is expected that plastic flow with inc
 reasing strain and length scale of inhomogeneity undergoes a laminar to ro
 tational transition\, rather like any fluid flow. When this is applied to 
 indentation plasticity\, one finds that rotational flow produces a density
  of geometrically necessary dislocations which can provide a quantitative 
 account of the indentation size effect. But at very small indentations\, l
 aminar flow occurs\, with build-up of material under the indenter. Combini
 ng these two flow patterns in parallel seems to provide a quantitative acc
 ount of the observed hardness behaviour.
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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